Slightly left field choice but how about a DS3 cabrio. Should be able to get a pretty good example for your budget.

Might be worth looking at cars that have a removeable/retractable (a reliable one) hard top rather than a soft-top.

Bearing in mind that a near neighbour (to me, in Eastern England) apparently just parted ways with his Ford Mustang V8 after it nearly bankrupted him because he did a whopping 30k miles last year in it! God knows how much fuel that must have used.

Note that cars with panaramic sunroofs must use far more fuel to keep the car cool (with the roof closed - like a greenhouse) in warmer weather using the AC or to overcome the extra drag when it's open on the move.

Many cars with panoramic sunroofs have a full length internal blind to reduce heat gain in summer and heat loss in winter.

My SUV has a panoramic sunroof and it is a nice to have.

Note that cars with panaramic sunroofs must use far more fuel to keep the car cool (with the roof closed - like a greenhouse) in warmer weather using the AC or to overcome the extra drag when it's open on the move.

Not so. If you look at a car from above you will see that the surface area of the windows admitting sunlight is far greater than that of a panoramic roof. Anyway, the better ones, e.g.my A8, are tinted and have an integrated solar panel which automatically powers a fan when the sun shines to cool the interior if parked outside. It also has a floating lip to combat fuel-sapping air turbulence, but if going that fast it gets closed.

Our Peugeot 2008's huge panoramic roof has a surprisingly small effect on interior temperature, especially if we remember to extend the white blind under it. Its main benefit is to create a pleasantly bright ambience during the many dark days of winter.

And to the OP - suggest consider a Lexus SC. Good cars, but they were rather unfashionable and therefore now excellent VFM. If only doing a tiny mileage, fuel consumption should not be an issue.